我想CARD_TABLE在XT架构中 获取表的DDL

SQL> select dbms_metadata.get_ddl('TABLE','CARD_TABLE','XT') from dual;
    ERROR:
    ORA-31603: object "CARD_TABLE" of type TABLE not found in
    schema "XT"
    ORA-06512: at "SYS.DBMS_METADATA", line 5746
    ORA-06512: at "SYS.DBMS_METADATA", line 8333
    ORA-06512: at line 1

但是我的选择查询有效

select count(*) from XT.CARD_TABLE;
count(*)
---------
0

我查询dba_objects它是否仍然在桌子上：

    SQL> select owner,object_type from DBA_OBJECTS
    where object_name='CARD_TABLE'  2
      3  ;


PUBLIC     SYNONYM
    XT     TABLE PARTITION
    XT     TABLE PARTITION
    XT     TABLE PARTITION
    XT     TABLE
    XT     TABLE PARTITION
    VAT    TABLE

    7 rows selected.